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3d20b7df6c
This saves a few queryInterface calls on the hot path. Differential Revision: https://phabricator.services.mozilla.com/D186976
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_AutoPrintEventDispatcher_h
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#define mozilla_dom_AutoPrintEventDispatcher_h
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#include "mozilla/dom/Document.h"
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#include "mozilla/dom/DocumentInlines.h"
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#include "nsContentUtils.h"
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#include "nsGlobalWindowOuter.h"
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#include "nsIPrintSettings.h"
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namespace mozilla::dom {
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class AutoPrintEventDispatcher {
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// NOTE(emilio): For fission iframes, we dispatch this event in
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// RecvCloneDocumentTreeIntoSelf.
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static void CollectInProcessSubdocuments(
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Document& aDoc, nsTArray<nsCOMPtr<Document>>& aDocs) {
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auto recurse = [&aDocs](Document& aSubDoc) {
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aDocs.AppendElement(&aSubDoc);
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CollectInProcessSubdocuments(aSubDoc, aDocs);
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return CallState::Continue;
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};
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aDoc.EnumerateSubDocuments(recurse);
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}
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MOZ_CAN_RUN_SCRIPT void DispatchEvent(bool aBefore) {
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for (auto& doc : mDocuments) {
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nsContentUtils::DispatchTrustedEvent(
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doc, nsGlobalWindowOuter::Cast(doc->GetWindow()),
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aBefore ? u"beforeprint"_ns : u"afterprint"_ns, CanBubble::eNo,
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Cancelable::eNo, nullptr);
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if (RefPtr<nsPresContext> presContext = doc->GetPresContext()) {
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presContext->EmulateMedium(aBefore ? nsGkAtoms::print : nullptr);
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// Ensure media query listeners fire.
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// FIXME(emilio): This is hacky, at best, but is required for compat
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// with some pages, see bug 774398.
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doc->EvaluateMediaQueriesAndReportChanges(/* aRecurse = */ false);
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}
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}
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}
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public:
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MOZ_CAN_RUN_SCRIPT explicit AutoPrintEventDispatcher(Document& aDoc) {
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if (!aDoc.IsStaticDocument()) {
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mDocuments.AppendElement(&aDoc);
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CollectInProcessSubdocuments(aDoc, mDocuments);
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}
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DispatchEvent(true);
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}
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MOZ_CAN_RUN_SCRIPT ~AutoPrintEventDispatcher() { DispatchEvent(false); }
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AutoTArray<nsCOMPtr<Document>, 8> mDocuments;
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const nsSize mPageSize;
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nsRect mVisibleAreaToRestore;
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};
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} // namespace mozilla::dom
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#endif
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